The Explanation of the Hadith: When Allah want good for a person He bestows on him Fiqh of the Religion
From the book:
Ṣaḥīḥ al-Bukhārī and Muslim authentically report the Ḥadīth of Mu’āwiyah (May Allah be pleased with him) in which the Prophet (May Allah raise his rank and grant him peace) said,
مَنْ يُرِدِ اللَّهُ بِهِ خَيْرًا يُفَقِّهْهُ فِي الدِّينِ
"When Allāh wants good for a person He bestows on him Fiqh of the Religion."
This tremendous demonstrates clearly the great status of Fiqh in the Religion. The person who busies himself with this great matter and has taken significant concern for it is among the signs that Allāh (The Exalted) wants good for his servant.
Allāh wanting as mentioned in the Ḥadīth refers to His divine decree and universal will,
مَنْ يُرِدِ اللَّهُ بِهِ خَيْرًا
"When Allāh wants good for a person."
Meaning, through Allāh’s universal and divine decree He grants his servant Fiqh, causes the servant to find pleasure in being busy with learning the Religion.
The word, “good” is mentioned in an indefinite form (in Arabic) to attach a level of importance and clarify the abundance of good to whomever Allāh bestows Fiqh of the religion which by it is a means for one's victory and success. The servant finding happiness in having Fiqh of the religion, devoting oneself to it, regularly attending the sittings of knowledge, being delighted with reading the books from the people of knowledge, also studying and memorizing is among the signs of good for the servant.
The servant should set aside a portion of his day for seeking knowledge. An avenue in which he acquires knowledge is that he doesn't let a day pass by without obtaining it. Doing this should be among the objectives that the Muslim strives for daily and is serious about acquiring beneficial knowledge. Rather this is the most significant objective the Muslim seeks and strives for its obtainment.